Why do northern cities often have smog in winter?

According to the Beidou think tank environmental protection housekeeper network, from autumn to winter, the haze weather in northern China has increased significantly. Many cities have serious air pollution and even explosions. The hardest hit areas of smog are mainly Henan and Hebei provinces, and the situation in Shanxi and Shandong is also more serious.

As a native northerner, I am deeply touched by the smog. Winter in the 1980s and 1990s was usually cloudy, but at that time we didn't know what smog weather was. But in recent years, the word smog has quickly become a highly recognized word in society. At the same time, people's attention to smog has also been unprecedentedly improved.

Haze is formed by the interaction of various pollutant particles, including automobile exhaust, industrial waste gas and construction dust. Even the Loess Plateau in northwest China is the main source of air particles that form smog. It can be said that in the northern cities of China, there are quite enough atmospheric particles that form smog.

Some people may say that the forest coverage rate in China is increasing year by year, and the Loess Plateau is now lush with vegetation. Coupled with the role of the Three-North Shelterbelt, there is little dusty weather now. The most intuitive thing is that our mother river, the Yellow River, has also become clear. It can be said that the chief culprit of smog today is obviously not the cause of the Loess Plateau.

There is no denying that our efforts to control the environment in China are obvious to all the world. Most of the pollution sources that form smog today are caused by human burning fossil fuels. According to the online statistics of environmental protection housekeeper of Beidou think tank, the number of motor vehicles in China reached an astonishing 327 million in 20 18, which is the main reason why the smog in China is still serious.

The second reason is industrial waste gas. China is a big industrial country, and the output of many industrial products ranks first in the world. Moreover, China's power generation enterprises mainly rely on thermal power generation, and heating in the northern region mainly depends on burning coal and boiling water, thus sending heating to thousands of households.

In addition to the above two points, there are also climate and terrain factors that cause serious smog in the north. A decade or two ago, there were several heavy snows in winter in the northern region, which played an irreplaceable role in purifying the air. Now there is little rain and snow in winter, and the purification effect of precipitation on the formation of the atmosphere is quite limited.

In addition, the areas with serious smog every year are nothing more than some cities here in Taihang Mountain. Due to the blocking effect of Taihang Mountain, it is difficult for winter gale to dilute the smog over southern North China. Now the city is developing rapidly, and there are many high-rise buildings around the city, which objectively aggravates the situation that pollutants cannot spread.